Re: Can mouse tracking speed be changed programmatically?

Subject: Re: Can mouse tracking speed be changed programmatically?
From: Rich Kubota <email@hidden>
Date: Wed, 25 Aug 2004 12:16:33 -0700

At 7:31 PM +0200 8/25/04, David Niemeijer wrote:

Is there a way to change the system-wide mouse tracking speed programmatically for the standard mouse driver using either cocoa, carbon or HID? The mouse system Preferences provide too little control in this case.
thanks,


try the following

#include <stdio.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/hidsystem/IOHIDLib.h>
#include <IOKit/hidsystem/IOHIDParameter.h>
#include <IOKit/hidsystem/event_status_driver.h>
//#include <Foundation/Foundation.h>

int
main()
{
    kern_return_t kr;
    double trackpadAcceleration, mouseAcceleration;
	NXEventHandle h = 0;

	h = NXOpenEventStatus();
	if (h == nil)
		return -1;

// Get the current "Tracking Speed". kr = IOHIDGetAccelerationWithKey( h, CFSTR(kIOHIDTrackpadAccelerationType), &trackpadAcceleration); kr = IOHIDGetAccelerationWithKey( h, CFSTR(kIOHIDMouseAccelerationType), &mouseAcceleration);

// Set the "Tracking Speed" to 1.0. Possible values are 0.0, 0.125, 0.3125, 0.5, 0.6875, 0.875, 1.0, 1.7. IOHIDSetAccelerationWithKey( h, CFSTR(kIOHIDTrackpadAccelerationType), 0.0); // Set the "Tracking Speed" to 1.0. Possible values are 0.0, 0.125, 0.3125, 0.5, 0.6875, 0.875, 1.0, 1.7. IOHIDSetAccelerationWithKey( h, CFSTR(kIOHIDMouseAccelerationType), 0.0);

	sleep(5); // wave the mouse/trackpad around

	// restore the acceleration

IOHIDSetAccelerationWithKey( h, CFSTR(kIOHIDTrackpadAccelerationType), trackpadAcceleration); IOHIDSetAccelerationWithKey( h, CFSTR(kIOHIDMouseAccelerationType), mouseAcceleration);

return (0); }

--
Sincerely,
Rich Kubota
email@hidden
(408) 974-6212
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